package Collection;

import java.util.ArrayList;
import java.util.Collection;

public class CollectionDemo {
    public static void main(String[] args) {
        /*Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);
        Point p=new Point(1,2);
        boolean contains=c.contains(p);
        System.out.println(contains);
        c.remove(p);
        System.out.println(c);*/
//        Collection cc=new ArrayList();
//        Point pp=new Point(9,8);
//        cc.add(pp);
//        System.out.println(cc);
//        System.out.println(pp);
//        pp.setX(100);
//        System.out.println(pp);
//        System.out.println(cc);
        Collection c=new ArrayList();
        c.add("one");
        c.add("two");
        c.add("tree");
        c.add("four");
        c.add("five");
        System.out.println(c);
        System.out.println(c.size());
        System.out.println(c.isEmpty());//检测是否为空集合
        c.clear();//清空集合
        System.out.println(c);
        System.out.println(c.size());//清空后为零
        System.out.println(c.isEmpty());//此时为空





    }
}
